The shootings Thursday at Ft. Hood were a "horrifying" attack on U.S. troops, President Barack Obama said Thursday.

Reacting during brief remarks this afternoon to the shooting at the Texas military installation, the president said that all details of the shootings were not clear, but he vowed a full investigation of the matter.

"These are men and women who have made the selfless and courageous decision to risk and, at times, give their lives to protect the rest of us on a daily basis," Obama said in brief remarks at the Dept. of Interior. "It is horrifying that they should come under fire on American soil."

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At least 12 people were killed in a shooting at the base this afternoon, and multiple reports say another were injured. Most of the victims were said to be soldiers, as reportedly was the gunman.

Obama said that his administration was working with the Pentagon, FBI, Department of Homeland Security and other federal agencies to investigate the killings, and pledged to support the more than 200,000 people at the installation with the full resources of the federal government.

"In the meantime, I would ask all Americans to keep the men and women of Ft. Hood in your prayers," Obama said. "I want all of you to know that as commander in chief, that there's no greater honor but no greater responsibility for me than to make sure the extaordinary men and women in uniform are properly cared for and their safety and security when they're at home is provided for."